Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Income tax expense (benefit) at US statutory rate	$ (33.8)	$ (42.8)	$ (48.3)
State taxes, net of federal benefit	0.1	(0.1)	(0.4)
Other	0.1	0.0	0.0
Effect of changes in tax laws or rates enacted	0.0	0.0	0.0
Effect of cross-border tax laws	0.0	0.0	0.9
Changes in valuation allowance	29.2	36.3	39.7
Other non-taxable or nondeductible items	2.3	(0.1)	1.4
Change in uncertain tax position	3.2	(3.6)	5.3
Total income tax expense	$ 4.6	$ (1.7)	$ 7.1
Percent
Income tax expense (benefit) at US statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	(0.10%)	(0.10%)	0.20%
Other foreign effects	(0.10%)
Effect of cross-border tax laws			(0.40%)
Changes in valuation allowance	(18.10%)	(17.80%)	(17.30%)
Other non-taxable or nondeductible items	(1.40%)	0.00%	(0.60%)
Change in uncertain tax position	(2.00%)	1.80%	(2.30%)
Total income taxes	(2.90%)	0.80%	(3.10%)
ISRAEL
Amount
Stock compensation	$ 8.7	$ 8.3	$ 8.5
Percent
Stock compensation	(5.40%)	(4.10%)	(3.70%)
Other foreign effects
Amount
Other foreign effects	$ 0.5	$ 0.3
Percent
Other foreign effects	(0.30%)	(0.10%)
United States
Amount
Stock compensation	$ (5.7)	$ 0.0	$ 0.0
Percent
Stock compensation	3.50%	0.00%	0.00%